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- W2074080379 abstract "Analyses of uranium concentration and U234U238 activity ratios were performed on 40 samples of marine phosphorites, almost all of them dredged from the present sea floor. In each sample, the concentration and isotopic composition of total uranium and U(IV) were analyzed. Uranium concentrations in the analyzed nodules vary between 6 and 524 ppm, tetravalent uranium constituting 38–84 per cent of the total. Whereas the mean activity ratio for total uranium is 0.97, the ratio in the U(IV) uranium is 0.71 and the calculated activity ratio for U(IV) uranium is 1.57. The interpretation of these results has two consequences: (a) All the analyzed nodules are old (probably older than 8 × 105 yr), and are at the present being eroded rather than deposited; hence, the deposition of phosphorite in the present day ocean is rather doubtful. (b) The difference in isotopic ratios between the two oxidation states of uranium generally confirms previously proposed mechanisms of uranium isotope fractionation. Differential oxidation of U234 is largely responsible for the measured U234U238 disequilibrium ratios. A model for evolution of uranium isotope activity ratios in different oxidation states is presented." @default.
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- W2074080379 date "1970-01-01" @default.
- W2074080379 modified "2023-09-24" @default.
- W2074080379 title "Uranium isotopes in sea-floor phosphorites" @default.
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- W2074080379 doi "https://doi.org/10.1016/0016-7037(70)90148-1" @default.
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